I followed up with Apple and worked through several troubleshooting options and nothing changed. I will note that I am only experiencing this issue with the Chamberlain complication. Others still work fine.

I am also having this same issue. The Chamberlain complication is the only one that does not show up in the selection menu. This was a really great feature when it was working. Any word on when there will be an app update to fix this?

I wish I knew. It was a great feature and I used it a lot. I spoke to both Apple and Chamberlain and neither said they could replicate the issue. For me, it happened after the last upgrade to the WatchOS.

Hey Mark,I figured it out. It does not show up on the iPhone watch app interface for selecting the complication, but it will show up if you customize from the watch itself. Follow these instructions: https://support.apple.com/en-us/HT205536

I recently got an Apple Watch 4 and initially I had a complication for Liftmaster, then it randomly disappeared. I've tried reinstalling the Liftmaster app but it did not fix the problem. I don't believe this is an Apple problem because Liftmaster is the only app that this has happened with. Is there a fix for this problem yet?

Correct. Maybe the issue is caused by Watch OS 5 and the app not syncing? I can access the app on the watch and raise or lower doors, but it takes three steps. Watchface complications seem to be limited to apps that provide updating info or access to contacts. I'm guessing either Apple doesn't see the need to allow Chamberlain in or Chamberlain app hasn't included the complication. I agree that it would be easier to have access to garage door status/control on the watchface. Apple Watch 4 is my first.